mirror of https://code.videolan.org/videolan/vlc
245 lines
6.1 KiB
C
245 lines
6.1 KiB
C
/*****************************************************************************
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* filesystem.c: Common file system helpers
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*****************************************************************************
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* Copyright (C) 2005-2006 VLC authors and VideoLAN
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* Copyright © 2005-2008 Rémi Denis-Courmont
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*
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* Authors: Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_fs.h>
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#include <vlc_sort.h>
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#include <assert.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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/**
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* Opens a FILE pointer.
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* @param filename file path, using UTF-8 encoding
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* @param mode fopen file open mode
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* @return NULL on error, an open FILE pointer on success.
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*/
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FILE *vlc_fopen (const char *filename, const char *mode)
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{
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int rwflags = 0, oflags = 0;
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for (const char *ptr = mode; *ptr; ptr++)
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{
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switch (*ptr)
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{
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case 'r':
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rwflags = O_RDONLY;
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break;
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case 'a':
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rwflags = O_WRONLY;
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oflags |= O_CREAT | O_APPEND;
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break;
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case 'w':
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rwflags = O_WRONLY;
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oflags |= O_CREAT | O_TRUNC;
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break;
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case 'x':
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oflags |= O_EXCL;
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break;
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case '+':
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rwflags = O_RDWR;
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break;
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#ifdef O_BINARY
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case 'b':
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oflags = (oflags & ~O_TEXT) | O_BINARY;
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break;
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case 't':
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oflags = (oflags & ~O_BINARY) | O_TEXT;
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break;
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#endif
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}
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}
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int fd = vlc_open (filename, rwflags | oflags, 0666);
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if (fd == -1)
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return NULL;
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FILE *stream = fdopen (fd, mode);
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if (stream == NULL)
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vlc_close (fd);
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return stream;
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}
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static int dummy_select( const char *str )
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{
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(void)str;
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return 1;
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}
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static int compar_void(const void *a, const void *b, void *data)
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{
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const char *sa = a, *sb = b;
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int (*cmp)(const char **, const char **) = data;
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return cmp(&sa, &sb);
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}
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/**
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* Does the same as vlc_scandir(), but takes an open directory pointer
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* instead of a directory path.
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*/
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int vlc_loaddir( DIR *dir, char ***namelist,
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int (*select)( const char * ),
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int (*compar)( const char **, const char ** ) )
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{
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assert (dir);
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if (select == NULL)
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select = dummy_select;
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char **tab = NULL;
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unsigned num = 0;
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rewinddir (dir);
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for (unsigned size = 0;;)
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{
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errno = 0;
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const char *entry = vlc_readdir (dir);
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if (entry == NULL)
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{
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if (errno)
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goto error;
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break;
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}
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if (!select (entry))
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continue;
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if (num >= size)
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{
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size = size ? (2 * size) : 16;
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char **newtab = realloc (tab, sizeof (*tab) * (size));
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if (unlikely(newtab == NULL))
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goto error;
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tab = newtab;
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}
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tab[num] = strdup(entry);
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if (likely(tab[num] != NULL))
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num++;
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}
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if (compar != NULL && num > 0)
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vlc_qsort(tab, num, sizeof (*tab), compar_void, compar);
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*namelist = tab;
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return num;
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error:
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for (unsigned i = 0; i < num; i++)
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free (tab[i]);
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free (tab);
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return -1;
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}
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/**
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* Selects file entries from a directory, as GNU C scandir().
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*
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* @param dirname UTF-8 diretory path
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* @param pointer [OUT] pointer set, on successful completion, to the address
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* of a table of UTF-8 filenames. All filenames must be freed with free().
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* The table itself must be freed with free() as well.
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*
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* @return How many file names were selected (possibly 0),
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* or -1 in case of error.
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*/
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int vlc_scandir( const char *dirname, char ***namelist,
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int (*select)( const char * ),
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int (*compar)( const char **, const char ** ) )
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{
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DIR *dir = vlc_opendir (dirname);
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int val = -1;
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if (dir != NULL)
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{
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val = vlc_loaddir (dir, namelist, select, compar);
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closedir (dir);
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}
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return val;
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}
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#if defined (_WIN32) || defined (__OS2__)
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# include <vlc_rand.h>
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int vlc_mkstemp( char *template )
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{
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static const char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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static const int i_digits = sizeof(digits)/sizeof(*digits) - 1;
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/* */
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assert( template );
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/* Check template validity */
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const size_t i_length = strlen( template );
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char *psz_rand = &template[i_length-6];
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if( i_length < 6 || strcmp( psz_rand, "XXXXXX" ) )
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{
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errno = EINVAL;
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return -1;
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}
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/* */
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for( int i = 0; i < 256; i++ )
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{
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/* Create a pseudo random file name */
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uint8_t pi_rand[6];
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vlc_rand_bytes( pi_rand, sizeof(pi_rand) );
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for( int j = 0; j < 6; j++ )
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psz_rand[j] = digits[pi_rand[j] % i_digits];
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/* */
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int fd = vlc_open( template, O_CREAT | O_EXCL | O_RDWR, 0600 );
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if( fd >= 0 )
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return fd;
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if( errno != EEXIST )
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return -1;
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}
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errno = EEXIST;
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return -1;
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}
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#endif
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